Double twister



Jall- 13, 1959 I J. BEYER I v 2,867,969

DOUBLE TWISTER Filed oet. 1, 1952 1N VENTOR @ezw qyer BY www ATTORNEY United States Patent O DOUBLE TWISTER Jen Beyer, Arnhem, Netherlands, lassigner to American Enka Corporation, Enka, N. C., a corporation of Delaware Application 0ctober 1, 1952, Serial No. 312,537

Claims priority, application Netherlands November 29, 1951 6 Claims. (Cl. 57-58.83)

This invention relates to textile yarn twisting'and more particularly to a double twister.

With the well-known double twister, or two-for-one twister, a yarn supply package is placed on a stator. The yarn unwinds from this relatively stationary package, passes with a certain pre-tension through the hollow spindle and leaves the device through a rapidly driven rotor. The yarn leaving the rotor balloons around the yarn package as it is wound in twisted condition on a take-up spool located above the yarn package.

The driven rotating part of the known double twister usually comprises a so-called take-up disk. This disk sometimes includes or has attached thereto a so-called buffer body which rotates at the same speed as the disk. During twisting, the yarn passes in contact with this buffer body after leaving the hollow spindle and before moving upward. The extent to which the yarn contacts the buffer body depends on a number of factors such as the pre-tension, thickness of the yarn, and spindle speed.

A great disadvantage of known double twisters is that the size of the yarn package placed on the double twister is-limitedby the size of the disk. Since the balloon formed by the yarn should not touch the package, the diameter of the yarn package generally cannot exceed and is usually smaller than the diameter of the rotor. Another disadvantage of known double twisters is the considerable power consumption of the rotating parts at higher R. P. M. The power consumption, of course, is greatly influenced by the size of the moving parts.

It -is an object of the present invention to provide an improved double twister.

Another object is to provide a double twisterjwhich will operate with smaller amounts of electric power.

A still further object of the invention is to provide a double twister of improved utility that may be readily adjusted to compensate for variations in process conditions.

Other objects will be apparent from the following description taken in conjunction with the attached drawings, wherein:

Figure l is a side elevational view of a double twister spindle embodying one form of the present invention;

Figure 2 is a perspective view showing in more detail the thread guiding member of Figure 1; and

Figure 3 is a plan View of a double twister spindle constructed according to the present invention and equipped with a modified form of thread guide.

In accordance with the present invention, a double twister is provided with a freely rotatable thread guiding member concentrically mounted around the driven spindle of the double twister. The double twister of the present invention possesses the advantages that no take-up disk is present and the driven rotor consists principally of a buffer body from which the yarn emerges. The dimensions, and particularly the diameter, of the buffer body are independent of the size of the yarn package to be twisted and may be kept as small as possible.

The freely rotatable thread guiding member gf the "ice present invention is preferably constructed in the form of a yer. This flyer may be made in various sizes, the important consideration being that as little resistance as possible is experienced during its rotation. Very good results are obtained if the flyer is constructed from a thin metal wire such as steel Wire, which surrounds the double twister spindle in the form of an eyelet. The end` of the metal wire is provided with any suitable thread guide, such as a thread eyelet.

Referring now to Figure l, the numeral 10 designates a yarn supply package being supported on stator member 11. Supply package 10 is concentrically arranged around a tubular member 13. Any well-known type of pre-tensioning member (not shown) may be present in tubular member 13. Tubular member 13 is in axial alignment with driven spindle 14 and stator member 11 is freely rotatably supported in known manner by said spindle. The upper part of spindle 14 is provided with an axial opening which communicates with radial opening 15 in a flange-like buffer body 16 which is attached to the spindle below and in spaced relation to stator member 11. The upper part of spindle 14, that is the part which lies above body 16, is of reduced diameter. The foregoing description comprises no part of the present invention but merely refers to known elements of a conventional double twister.

Disposed between stator 11 and buffer body 16 is a flyer member 17, concentrically mounted to rotate freely around driven spindle 14. A thread guide member 18 is attached to each extremity of flyer 17. As seen in Figure 2, thread guide 18 may comprise-a detachable fork. Flyer 17 is attached to a hub or ring-like member 9 which surrounds the spindle, as shown in Figure 3.

In operation, the yarn 12 is withdrawn from supply package 10 and passes via tubular member 13 through the axial opening in spindle 14 and out through the radial opening 15 in buffer body 16. The yarn 12 remains in contact with the buffer body 16 for a certain time, depending on such factors as the pre-tension and the speed, and then passes through the thread guide 18 and balloons upward to a winding device (not shown) via thread guide 19.

As the spindle 14 continues to rotate, the flyer 17 adjusts itself in such a waythat the yarn first lies in the form of an arc against buffer body 16 and then passes to the balloon through the thread guiding member`18 of flyer 17. If sudden changes occur in the tension during operation, injurious effects are prevented by a change in the position of the flyer with respect to the point where the yarn leaves the buffer body. Such changes also tend to be compensated for by an adjustment of the angle of contact of the yarn around the thread guiding member. However, the speed of rotation of the thread guiding member always remains equal to that of the rotating part of the twisting device.

Figure 3 illustrates a modified type of yer. Double flyer 20 consists of two metal wires, the ends of which are provided with eye-shaped thread guides 21 connected to a ring-shaped hub member 22 concentrically mounted for free rotation around driven hollow spindle 23. Double flyer 20 is mounted above buffer body 24 as in the arrangement described above.

Although it is sometimes possible, in the twisting of circle in a plane above the opening in the buffer body.

It will be obvious that the buffer body can have any shape, so long as its diameter is less than that of the flyer. lt is even possible to use the rotating spindle as a buffer body if its diameter is suitable for this purpose. The yer need not be a double flyer as indicated in the drawings) It is possible to use a"single lyerprovided with a counter-weight.

Very satisfactory results have been' 'obtiedfu'sin'g'a' yer, the thread guide of which 'described a circle having` a diameter of 190 inni. incombination with af'bu'ifer bodyl having a diameter of 56 mm. y Experiments 'were' poni ducted comparing such a device with a double twister of the usual structure having a rotor diameter of 180mm.v

It was vfound that the power consumption of the device' made according to the invention was 9 watts` at 6,000 R. P. ML and'17 Watts at 9,'000NR.A P. M. The power consumption of the 'double twister of conventional structure was 37. watts at 6,000 R. P. M. and 98 watts at 9,000 R. P.y M.Y Thus a considerable saving in electrical power 4is attainedrby the present invention.

An equally important advantage of the' double twister ofthe present invention is the manner in whichit may bev easily adaptedY to various processing circumstances by. merely exchanging the yeij. For example, the length ofA the flyerrnay bey easily adapted to the diameter of the yarn packageby providing flyers ofuvarious weights and shapes Vso that it is always possible to use the most suitable flyer for a particular size yarn.

While'preferred embodiments of this invention have been illustrated and described, it will be apparent to those skilled in the art lthat modifications are possiblewithout departing from the scope 'ofthe'inventi'on What is claimed isi n.

1.l A double twist spindle assembly for textile yarns comprising'a'rotatable spindle having an axial opening anda cofnniu'l'iic'atingradial opening, a'yarn package holder freelyrotatably supported by said spindle and a flyer disposedadj'a'centrt said radial'openin'g in coaxial relationship' wt1"'a`fid"t`ree1yrotatable with respect to said spindle.

2; A'duble twist spindle assembly forV textile yarns" comprising a rotatable spindle having an axial opening and a radial opening communicating therewith, a yarn package holder freely rotatably supported by said spindle above said radial opening and a flyer disposed beneath said packageholder incoaxial relationship with and freely rotatable with respect to said spindle. g y

3. A double'twist spindle assembly for textile yarns comprising a rotatable'spindle having an axial opening and a radial opening communicating therewith, a yarn package holder freely rotatably Vsupported by said spindle above said radial opening and a flyer disposed Vbetween said package holder and said radial opening in coaxial relationship with and freely rotatable with respect to said spindle, said yer extending beyond the normal periphery of a full yarn package carried by said holder.

4. Apparatus for twisting' textile yarns comprising a rotatable double twist spindle having an axial opening and a radial opening communicating'therewith, a yarn package holdernfreelyrotatably supported by saidspindle above said radial opening, a hub member disposed beneath said package holder in coaxial relationship with and freely rotatable with respecvtpto said spindle, at least one bar member'carried'by and extending radially from said hub member anda `yarn guide provided rat the outer end of each bar member.

5. Apparatus fortwistingtextile yarns comprising a rotatable double twist spindle having an axial opening and a radial opening communicating therewith, a yarn package holde'r'freely rotatably lsupported by said spindle above said radial opening, a' hub member disposed be'- tween saidpackagehol'der" and said'radial opening in coaxial relationship with'a'ndfreely rotatable with respect to'said spindle; atleast ori'ebar member carried by and extending radially from sai'dhub member and a yarn guide provided' at the outer end of each bar member, said yarn guide extending beyond the normal periphery of a full yarn package held by said package holder.

6. In a double twistingapparatus having a rotatable spindleprovidedwith an axial opening, a yarn package holderfreely rotatably supported by saidl spindle and a buffer body attached to said"spindle'below said package holder, said buffer body having a radialopening communicating with the axial'opening in'said spindle, the improvement comprising a yer" member disposed between said package holder `andjsaid buffer' body and freelv rotatably" supported by said spindle.

Rfieistdf-in $11.61 leise-Patent i UNITED STATES PATENTS- 2,391,307A Gwaltney Dec. 18; 1945r 2,442,775 Nelson June 8, 1948 2,499,726 Gotterill Mar. 7, 1950 2,524,217 Ancet Oct. 3, 1950 2,550,136 Clarkson Apr. 24, 1951 2,638,732 Sabaton May 19, 1953 FOREIGN PATENTS 415,635 Great Britain Aug. 30, 1934 721,877 Germany June 20, 1942 880,611 France Jan. 6, 1943 

